Over the last couple of decades I often contributed non-deductible funds to my IRA. Is there a provision that allows the movement of these funds to a Roth without paying taxes? (I have already paid income taxes on these funds)

"If you have non-deductible contributions in your IRA, you do not pay tax on the amount of non-deductible contributions. If you make a partial conversion, you must prorate your deductible and non-deductible contributions to all IRAs (including SEP and SIMPLE IRAs) as of December 31 of the year you convert."

If you had a 401(k) where you worked, there may be another option. You know the basis -- the amount of after-tax contribution you have made. Move the pre-tax portion (current balance less the basis) into the 401k (some 401k plans allow such transfers, and some 401k plans allow such transfers even after your are no longer an employee). Then convert the rest. This works because the rules for 401k transfers say that you move the pre-tax portion first, not pro-rated like withdrawals would be.